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首页> 外文会议>ASME turbine blade tip technical symposium 2013 : Turbine blade tip steady and unsteady aerodynamics ... >BUILDING UP SUITABLE CONTACT FORCES IN INTEGRALLY SHROUDED BLADE ROWS FOR REDUCING VIBRATION AMPLITUDES
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BUILDING UP SUITABLE CONTACT FORCES IN INTEGRALLY SHROUDED BLADE ROWS FOR REDUCING VIBRATION AMPLITUDES

机译：在整体带罩叶片行中建立合适的接触力以减少振动幅度

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摘要

The beneficial effects of the contact between shrouds are described extensively in recent literature: natural blade frequencies are increased and additional damping is available. Different models are proposed for analyzing its linear and nonlinear behavior, selection of optimum contact forces are proposed for reducing vibration amplitudes to a minimum. Results from different non linear analyses that use different models all based generally on a reduced modal model of the blade row and on the harmonic balance approach for modeling the non linear contact forces, are sometimes contradictory: some claim e.g. that increasing excitation amplitude leads to a reduction of the dynamic magnification factor (due to friction damping increase) some other claim the opposite. The contribution to this topic of the present paper is the analysis of the effect of a "contact shim " which can be inserted in a cavity between adjacent shrouds. The shim generates suitable contact forces between the shrouds of the blades of a row, which without shim would vibrate as free standing blades.
机译：护罩之间接触的有益效果在最近的文献中有详尽的描述：自然的叶片频率增加，并且附加的阻尼可用。提出了用于分析其线性和非线性行为的不同模型，提出了选择最佳接触力以将振动幅度减小到最小的建议。来自使用不同模型的不同非线性分析的结果通常都基于叶片行的简化模态模型和用于对非线性接触力进行建模的谐波平衡方法，这些结果有时是矛盾的。激振幅度的增加导致动态放大系数的减小（由于摩擦阻尼的增加），另一些说法相反。对本主题的贡献是对“接触垫片”的效果的分析，该垫片可以插入相邻护罩之间的空腔中。垫片在一行叶片的护罩之间产生合适的接触力，如果没有垫片，则该接触力会作为自由站立的叶片而振动。

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